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• Raspberry Pi USB Webcam Stream to Computer using Gstreamer

  17 mars 2016, par James

  I have a fisheye usb webcam attached to a raspberry pi that I’m trying to stream to a computer. I’ve played with ffmpeg and it seems a little laggy beyond 320x240. From what I’ve read people have been happy with gstreamer.

  So I’ve tested the usb webcam and it works locally

  gst-launch-1.0 -v v4l2src device=/dev/video0 ! 'video/x-raw,width=640,height=480' ! glimagesink

  These are the commands I’ve been trying to use to get the video to my computer. However, all I’m seeing is a green window.

  TCP Sever :gst-launch-1.0 -v v4l2src device=/dev/video0 ! 'video/x-raw,width=640,height=480,framerate=30/1' ! x264enc byte-stream=true ! rtph264pay ! gdppay ! tcpserversink host=192.168.200.38 port=5000 sync=false

  TCP Client : gst-launch-1.0 -v tcpclientsrc host=192.168.200.38 port=5000  ! gdpdepay !  rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false

  or

  UDP Server :
  gst-launch-1.0 -v v4l2src device=/dev/video0 ! 'video/x-raw,width=640,height=480,framerate=30/1' ! x264enc byte-stream=true  ! rtph264pay ! gdppay ! udpsink host=192.168.200.37 port=5000 sync=false

  UDP Client :
  gst-launch-1.0 -v udpsrc port=5000  ! gdpdepay !  rtph264depay ! avdec_h264 ! videoconvert ! autovideosink sync=false

  I figure I must be piping the plugins wrong somehow. Any advice is appreciated.

• FFMPEG RTSP issue

  18 mars 2019, par Joshua G

  So I am trying to stream an EZVIZ camera using FFMPEG. I am able to connect to the camera but when setting a duration like 5 or 10 seconds I get videos of random lengths (7, 5, 10, 30, etc). Sometimes the videos generated are black, sometimes green (though I can see the outlines of things and parts of the timestamp when it is green). I also get videos that show a length say 3 mins or so but they play ulta-fast, like a 3 min video plays in a millisecond and they are all black. Below is the log. Any help would be great !

  ./ffmpeg.exe -err_detect ignore_err -rtsp_transport tcp -i rtsp://un:pw@192.168.0.2/Streaming/channels/101 -vcodec copy -t 00:00:10 c:/Temp/vid.mp4
  
  ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  [h264 @ 046d7840] non-existing PPS 60 referenced
  
      Last message repeated 1 times
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] no frame!
  
  [h264 @ 046d7840] non-existing PPS 2 referenced
  
      Last message repeated 1 times
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] no frame!
  
  [h264 @ 046d7840] cabac_init_idc 5 overflow
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] no frame!
  
  [h264 @ 046d7840] concealing 15924 DC, 15924 AC, 15924 MV errors in P frame
  
  [h264 @ 046d7840] number of reference frames (0+2) exceeds max (1; probably corrupt input), discarding one
  
  [h264 @ 046d7840] non-existing PPS 28 referenced
  
      Last message repeated 1 times
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] no frame!
  
  [h264 @ 046d7840] non-existing PPS 7 referenced
  
      Last message repeated 1 times
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] no frame!
  
  [h264 @ 046d7840] illegal aspect ratio
  
  [h264 @ 046d7840] non-existing PPS 1 referenced
  
  [h264 @ 046d7840] illegal aspect ratio
  
      Last message repeated 2 times
  
  [h264 @ 046d7840] A non-intra slice in an IDR NAL unit.
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] no frame!
  
  [h264 @ 046d7840] Missing reference picture, default is 0
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] Frame num change from 3 to 413
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] non-existing PPS 1 referenced
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] non-existing PPS 23 referenced
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] slice type 32 too large at 2
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] reference count 1 overflow
  
  [h264 @ 046d7840] slice type 15 too large at 0
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] no frame!
  
  [h264 @ 046d7840] non-existing PPS 22 referenced
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] non-existing PPS 1 referenced
  
  [h264 @ 046d7840] decode_slice_header error
  
  [h264 @ 046d7840] Frame num change from 31 to 495
  
  [h264 @ 046d7840] decode_slice_header error
  
  [rtsp @ 046d4f00] decoding for stream 0 failed
  
  Input #0, rtsp, from 'rtsp://admin:b729sefc@192.168.0.2/Streaming/channels/101':
  
    Metadata:
  
      title           : Media Server V3.2.1
  
      comment         : Media Server Session Description : standard
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 2688x1520 [SAR 1:1 DAR 168:95], 10 fps, 10 tbr, 90k tbn, 20 tbc
  
  Output #0, mp4, to 'c:/Temp/vid.mp4':
  
    Metadata:
  
      title           : Media Server V3.2.1
  
      comment         : Media Server Session Description : standard
  
      encoder         : Lavf58.12.100
  
      Stream #0:0: Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709, progressive), 2688x1520 [SAR 1:1 DAR 168:95], q=2-31, 10 fps, 10 tbr, 90k tbn, 90k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [NULL @ 046d7840] illegal reordering_of_pic_nums_idc 706.80 bitrate=1850.5kbits/s speed=5.97x
  
  [NULL @ 046d7840] illegal aspect ratio
  
  [NULL @ 046d7840] non-existing PPS 1 referenced=00:00:07.70 bitrate=2178.9kbits/s speed=4.51x
  
  [NULL @ 046d7840] reference count 2 overflowime=00:00:09.30 bitrate=2255.0kbits/s speed=2.74x
  
  [NULL @ 046d7840] non-existing PPS 1 referenced
  
  frame=   63 fps= 15 q=-1.0 Lsize=    2781kB time=00:00:09.90 bitrate=2301.5kbits/s speed=2.41x
  
  video:2780kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.054839%

• Programmatically sending bytes to ffmpeg via STDIN to create still image file

  8 octobre 2019, par Sam Marrocco

  I am attempting to use vb.net code to send individual pixel information as bytes to ffmpeg with the purpose of saving a still DPX image file. I have already successfully read DPX files and output them via STDOUT into vb.net code.

  There seem to be many examples out there of piping movie files but there are also discrepancies, such as some people using image2pipe and others using rawvideo. I am uncertain when to use one over the other. The various methods I’ve tried result in ffmpeg returned errors such as "Packet too small for DPX header" or "Error while decoding stream #0:0 : Invalid data found when processing input". As I understand it, I am not providing a header, only the raw individual pixel RGBRGBRGB.... values as a byte array.

  The arguments sent to ffmpeg via command line are :

  -f image2pipe -pix_fmt rgb24 -s 16x16 -bits_per_raw_sample 8 -c:v dpx -i - \MyPath\MyFilename.dpx

  My vb.net code is as follows :

  Dim P As New Process
  
  P.StartInfo.FileName = m_FFMPEGExecutable_PathFile
  
  P.StartInfo.Arguments = (see above arguments)
  
  P.StartInfo.UseShellExecute = False
  
  P.StartInfo.CreateNoWindow = True
  
  P.StartInfo.RedirectStandardInput = True
  
  p.Start
  
  
  
  
  
  'Test image: A single red, green, blue, black and white pixel followed by all black
  
  
  
  Dim Tiny((16 * 16) - 1) As Byte
  
  
  
  Tiny(0) = 255
  
  Tiny(1) = 0
  
  Tiny(2) = 0
  
  
  
  Tiny(3) = 0
  
  Tiny(4) = 255
  
  Tiny(5) = 0
  
  
  
  Tiny(6) = 0
  
  Tiny(7) = 0
  
  Tiny(8) = 255
  
  
  
  For i As byte = 9 To ((16x16)-1)
  
     Tiny(i) = 255
  
  Next
  
  
  
  'Send the rgb byte array to ffmpeg:
  
  P.StandardInput.BaseStream.Write(Tiny, 0, Tiny.Length)
  
  P.StandardInput.Flush()
  
  P.StandardInput.Close()

  I have tried many variations on the above ffmpeg arguments but cannot seem to avoid these errors. Any suggestions would be appreciated, including information on when to use image2pipe vs. rawvideo.